(19)
(11) EP 1 519 474 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.05.2008 Bulletin 2008/21

(43) Date of publication A2:
30.03.2005 Bulletin 2005/13

(21) Application number: 04023198.7

(22) Date of filing: 29.09.2004
(51) International Patent Classification (IPC): 
H02M 3/158(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 29.09.2003 US 673684

(71) Applicant: Intersil Americas Inc.
Milpitas, CA 95035 (US)

(72) Inventors:
  • Walters, Michael M.
    North Carolina 27502 (US)
  • Jochum, Thomas A.
    NC 27713 (US)
  • Li, Xuening
    NC 27519 (US)

(74) Representative: Fleuchaus, Andrea et al
Fleuchaus & Gallo Partnerschaft Patent- und Rechtsanwälte Sollner Strasse 36
81479 München
81479 München (DE)

   


(54) Synchronization of multiphase synthetic ripple voltage regulator


(57) A multiphase ripple voltage regulator generator employs a hysteretic comparator referenced to upper and lower voltage thresholds. The hysteretic comparator monitors a master ripple voltage waveform developed across a capacitor supplied with a current proportional to the difference between the output voltage and either the input voltage or ground. The output of the hysteretic comparator generates a master clock signal that is sequentially coupled to PWM latches, the states of which define the durations of respective components of the synthesized ripple voltage. A respective PWM latch has a first state initiated by a selected master clock signal and terminated by an associated phase voltage comparator that monitors a respective phase node voltage.







Search report